Form Submission override does not work

[lwm]

I have created a simple HTML form (with no WebZones/Parts) on a SharePoint
server, and the form does everything it is ment to, but it does not pick up
the fact that I have entered in a different confirmation page as entered in
the following dialog box

Form Properties > Options > Confirmation Page > URL of confirmation page
(Optional): brox_confirmation.htm

The Confirmation page displayed after submission is the default one located
at /_vti_bin/shtml.dll/brox_order.htm

The webbot within the page is as follows

<form method="POST" action="--WEBBOT-SELF--" name="Brox_Order">
<!--webbot bot="SaveResults"
U-File="_private/form_results.csv"
S-Format="TEXT/CSV"
S-Label-Fields="TRUE"
startspan
B-Reverse-Chronology="FALSE"
S-Email-Format="TEXT/PRE"
S-Email-Address="(e-mail address removed)"
B-Email-Label-Fields="TRUE"
S-Builtin-Fields="REMOTE_NAME REMOTE_USER HTTP_USER_AGENT Date
Time"
B-Email-Subject-From-Field="FALSE"
S-Email-Subject="Brochure Order Request"
S-Date-Format="%A, %d %B %Y"
S-Time-Format="%H:%M:%S %Z"
U-Confirmation-Url="brox_confirmation.htm" --><!--webbot
bot="SaveResults" endspan -->
<table>
....
</table>
<p>
<input type="submit"
value="Submit"
name="Brox_Order"/>
<input type="reset"
value="Reset"
name="Reset"/>
</p>
</form>

I have seen one other post on the net of the same problem, but no
resolution. Has anyone got any ideas?